Gas flow controller



FIG. 1 is a perspective view of a gas flow controller, showing our new design;

FIG. 2 is a top plan view;

FIG. 3 is a left side elevational view;

FIG. 4 is a left end elevational view;

FIG. 5 is a right side elevational view;

FIG. 6 is a right end elevational view; and,

FIG. 7 is a bottom plan view. 

The ornamental design for a gas flow controller, as shown and described. 